Name
LESSON
Date
Class
Practice C
9-5 Classifying Polygons
Determine whether each figure is a polygon. Explain your
answer.
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
12.
Name each polygon.
Determine if the figures in each exercise can be put together to
form a regular polygon. If so, name the regular polygon.
13.
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14.
15.
43
Holt Mathematics
Practice A
9-5 Classifying Polygons
Practice B
9-5 Classifying Polygons
LESSON
LESSON
Determine whether each figure is a polygon. Explain your
answer.
1.
2.
3.
1.
no; open figure
yes
4.
Determine whether each figure is a polygon. Explain your
answer.
5.
2.
yes
yes
no; line segments
6.
no; segments cross
no; curved lines
cross
4.
yes
3.
5.
6.
no; curved figure
yes
Draw a line from each polygon to its correct name.
yes
no; not a
closed figure
7.
octagon
Name each polygon.
quadrilateral
7.
8.
9.
heptagon
decagon
pentagon
triangle
10.
nonagon
octagon
11.
12.
hexagon
hexagon
Determine whether each figure is a regular polygon. Explain
your answer.
8.
9.
10.
quadrilateral
heptagon
Name each figure and tell whether it is a regular polygon.
Explain your answer.
73°
13.
34°
14.
15.
108°
108°
45° 6 ft 45°
6 ft
108°
6 ft
135°
73°
yes
no; all sides and
no; all angles
angles not congruent
not congruent
108°
quadrilateral;
pentagon; yes
trapezoid;
no; all angles
no; all sides and
not congruent
41
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Holt Mathematics
angles not congruent
42
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Holt Mathematics
Review for Mastery
9-5 Classifying Polygons
Practice C
9-5 Classifying Polygons
LESSON
LESSON
A polygon is a closed figure that starts and stops at the same
point. A polygon is made up of line segments that do not cross.
Determine whether each figure is a polygon. Explain your
answer.
1.
135°
14 ft
108°
2.
3.
Determine whether each figure is a polygon. If it is not, explain why not.
1.
no; lines cross
4.
yes
5.
2.
3.
no; curved lines
6.
yes
no; open figure
yes
no; not closed
no; segments cross
Polygons can be classified by the number of sides or angles. The
number of sides and angles is the same.
no; lines cross
Name each polygon.
7.
8.
Complete the table.
9.
Name
pentagon
10.
decagon
11.
nonagon
heptagon
12.
quadrilateral
octagon
Determine if the figures in each exercise can be put together to
form a regular polygon. If so, name the regular polygon.
13.
14.
Number of Sides
Number of Angles
4.
Triangle
3
3
5.
Quadrilateral
4
6.
Pentagon
4
5
7.
Hexagon
6
6
8.
Heptagon
7
7
9.
Octagon
8
8
10.
Nonagon
9
9
11.
Decagon
10
10
5
All the sides of a regular polygon have the same length, and all the
angles have the same measure.
15.
Determine whether each is a regular polygon. Explain your answer.
yes; square
yes; hexagon
12.
no
110° 8 cm 70°
8 cm
70° 8 cm
8 cm
110°
no; angles not equal
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
43
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
Holt Mathematics
Copyright © by Holt, Rinehart and Winston.
All rights reserved.
105
13.
120°2 in. 120°
2 in.
120°
2 in.
2 in.
120°
120°
2 in.
120°
2 in.
yes
44
14.
9 in.
4 in.
90°
90°
90°
90°
no; sides not equal
Holt Mathematics
Holt Mathematics